Improvement in dies for drawing tubes



fn. m.` so'MEns. Dies for Diawing Tubes. N0.l52,l85, Patentedlune16,1874.

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VUrrrriizr) STATES PATENT OFFICE.

DANI'EL MLsoMERs; or BROOKLYN, NEW YORK.

lMPRovEME'NT iN bles Fon oR'Awi'Ne TUBES.

Specification ormingpart o f Letters Patent No. 152,185, dated J une 16, 1&74; applcation filed April 2o, 1874.

1 To all whom it may concern:

Be 1t known that I, DANIEL M. Solanas,-

of Brooklyn, in the county of Kings and State ot' New York, have invented an Improvement in Machines for Making SplitMetal and other ETubes. of which the following is a specitica-V tion:

' This invention relates to that inethod or' process of making split tubes suitable .-for pen-holders and other purposes, of which the machine described in Letters Patent No.

130,758, issued to me August 2.0, 1872,.is theV practical embodiment, so far, at least, as re- 4 gards the forcing'of the tube-blank, aft-er be- -ing bent around a .mandrelf'ixieet'at'its' edges, through a steel or hard d raw-die, by a.

shoulder on theV mandrel acting against the back end of the tube-shaped blank, such draw-I -from riding over the shoulder of the latter while 'being entered or 'forced through the draw-die.

The machine, generally, may be set either to work horizontally, vertically, or otherwise; and it will be unnecessary here to specify means for preparing the metal or other blank, land for lapping it around or depositing it on the reduced portion ofthe mandrel correspondingltothe interior size of the tube to be produced as such means may be the same as enlploy in my machine hereinbefore rctbrred to.

'In the accompanying drawing, Figure 1 represents a longitudinal sectional view of the devices to which my improvement relates, together with a tube in the course of being made; and Fig. 2, a sectional View upon a larger scale of thedies and mandrel without the tube. j

,A is the mandrel, arranged toslide through one. or more suitable bearings, and occupying f a concentric position in relation with the dies. This mandrel, or its reduced forward portion b, which corresponds with the interior size of the tube to be produced, is formed with a rear collar or shoulder, c, of a diameter that will admit of-its passage through. thedraw-die l.

The tube Ior heilt blank U, being formed or arranged' around the reduced portion b of the mandrel, with its longitudinal edges approximating or-1neeting, andfit-s back. end resting against the shoulder or collar o of the mandrel, isforeed by said shoulder with the requisite power or pressure through the steel or hard draw-die B, to insure the perfect closing of and necessary finish of the tube. As, however, in making tubes of thin metal, the tube, in entering and being forced through the draw-die, is apt to ride over the shoulder c lot -the mandrel, I arrange, immediately in front of the draw-die B, a slightly larger die or clamp, D, of a size tha-t will keep the tube closed around the portion b ofthe mandrel, so that it cannot slip back over tleA shoulder c.

This die or cla-mp l), which may either bea close one, or a split one kept closed by a spring,

isnot designed to exert any drawing tendency on the tube, lult simply to serve, in connection with the shoulder c, to insure thc projection of the tube through the draw-die.

I claml The combination of the advance closing dic or clamp D with 'the shouldered mandrel A and draw-bar B, substantially as and for the purposes herein set forth.

y l l). M.- SOMERS.

Witnesses:

MicnAEL RrAN, VERNON H. HARRIS. 

